gstreamer/gst-libs/gst/gl/win32/gstglcontext_wgl.c

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/*
* GStreamer
* Copyright (C) 2008 Julien Isorce <julien.isorce@gmail.com>
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "../gstgl_fwd.h"
#include <gst/gl/gstglcontext.h>
#include "gstglcontext_wgl.h"
#include <GL/wglext.h>
#define gst_gl_context_wgl_parent_class parent_class
G_DEFINE_TYPE (GstGLContextWGL, gst_gl_context_wgl, GST_GL_TYPE_CONTEXT);
static guintptr gst_gl_context_wgl_get_gl_context (GstGLContext * context);
static void gst_gl_context_wgl_swap_buffers (GstGLContext * context);
static gboolean gst_gl_context_wgl_choose_format (GstGLContext * context,
GError ** error);
static gboolean gst_gl_context_wgl_activate (GstGLContext * context,
gboolean activate);
static gboolean gst_gl_context_wgl_create_context (GstGLContext * context,
GstGLAPI gl_api, GstGLContext * other_context, GError ** error);
static void gst_gl_context_wgl_destroy_context (GstGLContext * context);
GstGLAPI gst_gl_context_wgl_get_gl_api (GstGLContext * context);
static GstGLPlatform gst_gl_context_wgl_get_gl_platform (GstGLContext *
context);
static void
gst_gl_context_wgl_class_init (GstGLContextWGLClass * klass)
{
GstGLContextClass *context_class = (GstGLContextClass *) klass;
context_class->get_gl_context =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_get_gl_context);
context_class->choose_format =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_choose_format);
context_class->activate = GST_DEBUG_FUNCPTR (gst_gl_context_wgl_activate);
context_class->create_context =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_create_context);
context_class->destroy_context =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_destroy_context);
context_class->swap_buffers =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_swap_buffers);
context_class->get_proc_address =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_get_proc_address);
context_class->get_gl_api = GST_DEBUG_FUNCPTR (gst_gl_context_wgl_get_gl_api);
context_class->get_gl_platform =
GST_DEBUG_FUNCPTR (gst_gl_context_wgl_get_gl_platform);
}
static void
gst_gl_context_wgl_init (GstGLContextWGL * context_wgl)
{
}
/* Must be called in the gl thread */
GstGLContextWGL *
gst_gl_context_wgl_new (void)
{
GstGLContextWGL *context = g_object_new (GST_GL_TYPE_CONTEXT_WGL, NULL);
return context;
}
static gboolean
gst_gl_context_wgl_create_context (GstGLContext * context,
GstGLAPI gl_api, GstGLContext * other_context, GError ** error)
{
GstGLWindow *window;
GstGLContextWGL *context_wgl;
HGLRC external_gl_context = NULL;
PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = NULL;
HDC device;
context_wgl = GST_GL_CONTEXT_WGL (context);
window = gst_gl_context_get_window (context);
device = (HDC) gst_gl_window_get_display (window);
if (other_context) {
if (gst_gl_context_get_gl_platform (other_context) != GST_GL_PLATFORM_WGL) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_WRONG_CONFIG,
"Cannot share context with a non-WGL context");
goto failure;
}
external_gl_context = (HGLRC) gst_gl_context_get_gl_context (other_context);
}
context_wgl->wgl_context = wglCreateContext (device);
if (context_wgl->wgl_context)
GST_DEBUG ("gl context created: %" G_GUINTPTR_FORMAT,
(guintptr) context_wgl->wgl_context);
else {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_CREATE_CONTEXT, "failed to create glcontext:0x%x",
(unsigned int) GetLastError ());
goto failure;
}
g_assert (context_wgl->wgl_context);
if (external_gl_context) {
wglMakeCurrent (device, context_wgl->wgl_context);
wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)
wglGetProcAddress ("wglCreateContextAttribsARB");
if (wglCreateContextAttribsARB != NULL) {
wglMakeCurrent (device, 0);
wglDeleteContext (context_wgl->wgl_context);
context_wgl->wgl_context =
wglCreateContextAttribsARB (device, external_gl_context, 0);
if (context_wgl->wgl_context == NULL) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_CREATE_CONTEXT,
"failed to share context through wglCreateContextAttribsARB 0x%x",
(unsigned int) GetLastError ());
goto failure;
}
} else if (!wglShareLists (external_gl_context, context_wgl->wgl_context)) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_CREATE_CONTEXT,
"failed to share contexts through wglShareLists 0x%x",
(unsigned int) GetLastError ());
goto failure;
}
}
GST_LOG ("gl context id: %" G_GUINTPTR_FORMAT,
(guintptr) context_wgl->wgl_context);
gst_object_unref (window);
return TRUE;
failure:
gst_object_unref (window);
return FALSE;
}
static void
gst_gl_context_wgl_destroy_context (GstGLContext * context)
{
GstGLContextWGL *context_wgl;
context_wgl = GST_GL_CONTEXT_WGL (context);
if (context_wgl->wgl_context)
wglDeleteContext (context_wgl->wgl_context);
context_wgl->wgl_context = NULL;
}
static gboolean
gst_gl_context_wgl_choose_format (GstGLContext * context, GError ** error)
{
GstGLWindow *window;
PIXELFORMATDESCRIPTOR pfd;
gint pixelformat = 0;
gboolean res = FALSE;
HDC device;
window = gst_gl_context_get_window (context);
gst_gl_window_win32_create_window (GST_GL_WINDOW_WIN32 (window), error);
device = (HDC) gst_gl_window_get_display (window);
gst_object_unref (window);
pfd.nSize = sizeof (PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cRedBits = 8;
pfd.cRedShift = 0;
pfd.cGreenBits = 8;
pfd.cGreenShift = 0;
pfd.cBlueBits = 8;
pfd.cBlueShift = 0;
pfd.cAlphaBits = 0;
pfd.cAlphaShift = 0;
pfd.cAccumBits = 0;
pfd.cAccumRedBits = 0;
pfd.cAccumGreenBits = 0;
pfd.cAccumBlueBits = 0;
pfd.cAccumAlphaBits = 0;
pfd.cDepthBits = 24;
pfd.cStencilBits = 8;
pfd.cAuxBuffers = 0;
pfd.iLayerType = PFD_MAIN_PLANE;
pfd.bReserved = 0;
pfd.dwLayerMask = 0;
pfd.dwVisibleMask = 0;
pfd.dwDamageMask = 0;
pfd.cColorBits = (BYTE) GetDeviceCaps (device, BITSPIXEL);
pixelformat = ChoosePixelFormat (device, &pfd);
if (!pixelformat) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_FAILED,
"Failed to choose a pixel format");
return FALSE;
}
res = SetPixelFormat (device, pixelformat, &pfd);
return res;
}
static void
gst_gl_context_wgl_swap_buffers (GstGLContext * context)
{
GstGLWindow *window = gst_gl_context_get_window (context);
HDC device = (HDC) gst_gl_window_get_display (window);
SwapBuffers (device);
gst_object_unref (window);
}
static guintptr
gst_gl_context_wgl_get_gl_context (GstGLContext * context)
{
return (guintptr) GST_GL_CONTEXT_WGL (context)->wgl_context;
}
static gboolean
gst_gl_context_wgl_activate (GstGLContext * context, gboolean activate)
{
GstGLWindow *window;
GstGLContextWGL *context_wgl;
HDC device;
gboolean result;
window = gst_gl_context_get_window (context);
context_wgl = GST_GL_CONTEXT_WGL (context);
device = (HDC) gst_gl_window_get_display (window);
if (activate) {
result = wglMakeCurrent (device, context_wgl->wgl_context);
} else {
result = wglMakeCurrent (NULL, NULL);
}
gst_object_unref (window);
return result;
}
GstGLAPI
gst_gl_context_wgl_get_gl_api (GstGLContext * context)
{
return GST_GL_API_OPENGL;
}
static GstGLPlatform
gst_gl_context_wgl_get_gl_platform (GstGLContext * context)
{
return GST_GL_PLATFORM_WGL;
}
gpointer
gst_gl_context_wgl_get_proc_address (GstGLContext * context, const gchar * name)
{
gpointer result;
GstGLAPI gl_api = gst_gl_context_get_gl_api (context);
if (!(result = gst_gl_context_default_get_proc_address (gl_api, name))) {
result = wglGetProcAddress ((LPCSTR) name);
}
return result;
}
guintptr
gst_gl_context_wgl_get_current_context (void)
{
return (guintptr) wglGetCurrentContext ();
}